初一一元一次方程三题数学题一:某服装商店出售一种优惠购物卡,花200元买这种卡后,凭卡可在这家商店按8折购物.什么情况下买购物卡合算?二:一列火车匀速行驶,经过一条长300m的隧道需要20s
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![初一一元一次方程三题数学题一:某服装商店出售一种优惠购物卡,花200元买这种卡后,凭卡可在这家商店按8折购物.什么情况下买购物卡合算?二:一列火车匀速行驶,经过一条长300m的隧道需要20s](/uploads/image/z/8606297-65-7.jpg?t=%E5%88%9D%E4%B8%80%E4%B8%80%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E4%B8%89%E9%A2%98%E6%95%B0%E5%AD%A6%E9%A2%98%E4%B8%80%3A%E6%9F%90%E6%9C%8D%E8%A3%85%E5%95%86%E5%BA%97%E5%87%BA%E5%94%AE%E4%B8%80%E7%A7%8D%E4%BC%98%E6%83%A0%E8%B4%AD%E7%89%A9%E5%8D%A1%2C%E8%8A%B1200%E5%85%83%E4%B9%B0%E8%BF%99%E7%A7%8D%E5%8D%A1%E5%90%8E%2C%E5%87%AD%E5%8D%A1%E5%8F%AF%E5%9C%A8%E8%BF%99%E5%AE%B6%E5%95%86%E5%BA%97%E6%8C%898%E6%8A%98%E8%B4%AD%E7%89%A9.%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8B%E4%B9%B0%E8%B4%AD%E7%89%A9%E5%8D%A1%E5%90%88%E7%AE%97%3F%E4%BA%8C%3A%E4%B8%80%E5%88%97%E7%81%AB%E8%BD%A6%E5%8C%80%E9%80%9F%E8%A1%8C%E9%A9%B6%2C%E7%BB%8F%E8%BF%87%E4%B8%80%E6%9D%A1%E9%95%BF300m%E7%9A%84%E9%9A%A7%E9%81%93%E9%9C%80%E8%A6%8120s)
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